The Contra Costa County Fire Protection District and Crockett-Carquinez Fire Protection District have adopted updated Fire Hazard Severity Zone (FHSZ) maps to comply with state-mandated fire hazard classifications and ensure consistency with local conditions. The updated maps are effective as of July 10, 2025.

The Districts’ actions are in response to California Government Code Section 51178, which requires the Office of the State Fire Marshal to identify moderate, high, and very high fire hazard zones based on a standardized, science-driven model. Additionally, California Government Code Section 51179 mandates the State Fire Marshal to provide recommendations for local adoption of these designations.

CALFIRE’s scientists and wildfire mitigation experts developed the FHSZ maps using a science-based, field-tested model that assigns a hazard score based on the factors that influence fire likelihood and fire behavior. Many factors are considered, such as fire history, natural vegetation, terrain, predicted flame lengths, ember travel, and typical fire weather patterns.

Per California Government Code Section 51179, a local agency may not decrease the level of fire hazard severity zone as identified by the State Fire Marshal for any area within its jurisdiction. This ensures that fire hazard designations remain consistent with CALFIRE’s scientifically determined hazard assessments. The Districts have adopted maps consistent with those recommended by the State Fire Marshal.

Residents and property owners are encouraged to review the map and understand their property’s designation.

The new maps may be found at:

New Maps Found Here

For questions regarding the FHSZ map and the science used in its development, please contact CALFIRE at FHSZinformation@fire.ca.gov.